Para Bellum is a Stamina/Health-based medium armor set. With the 5-piece set bonus you can gain a damage shield that absorbs 12040 damage if you have not taken any damage in the last 10 seconds.
The Para Bellum set is part of the Orsinium DLC and can be found in the Maelstrom Arena in Wrothgar. Each set item is bound on pickup. You can acquire medium armor, weapons and jewelry of this set in the Trinimac motif style